Transmission device for lawn mower

Abstract

The present invention relates to the technical field of lawn mower devices, and specifically discloses a transmission device for a lawn mower, wherein a connecting end plate is provided at the top of an outer shell, an annular cavity is provided at the top of the outer shell, an outer ring cavity and a spiral cavity are provided below the annular cavity, a through hole is provided between the top surface of the outer ring cavity and the bottom surface of the annular cavity, the outer wall of the outer shell is in a wave shape, the outer wall of a connecting shaft rotatably sleeved in the central cavity of the outer shell is axially connected with strips, a connecting slot is provided on the top surface of the connecting shaft, a ball is connected to the bottom end of the connecting shaft, the top of a connecting short column is fixedly connected to the bottom surface of the connecting sleeve at a central position, the ball is rotatably sleeved in a spherical groove provided inside the connecting sleeve, bearings are respectively sleeved between the connecting shaft and the two ends of the central cavity of the outer shell, the top and bottom surfaces of the bearings are respectively positioned and fixed using a baffle and an upper blocking plate or a lower blocking plate; the problems of large size and poor heat dissipation effect of the lawn mower blade transmission device are solved.

Description

Technical Field

[0001] The invention relates to the technical field of lawn mower devices, in particular to a transmission device for lawn mowers. Background Art

[0002] A lawn mower is also called a weed cutter, a lawn mower, a lawn trimmer, etc. A lawn mower is a mechanical tool used to trim lawns and vegetation, etc. It is generally composed of a cutter disc, an engine, a running wheel, a running mechanism, a blade, a handrail, and a control part. The cutter disc is mounted on the running wheel, the engine is mounted on the cutter disc, and the blade is mounted on the output shaft of the engine. The blade uses the high-speed rotation of the engine to increase the speed a lot, saving the working time of the weeding workers and reducing a lot of human resources.

[0003] At present, the blades of widely used lawn mowers are generally connected to the engine through a reduction gearbox to achieve power transmission. However, the reduction gearbox is generally heavy and large in size, and the grease used for heat dissipation and lubrication inside is difficult to dissipate heat quickly and effectively, which is not conducive to long-term continuous operation of the equipment. At the same time, this setting is also difficult to adapt to the miniaturization and lightweight design of the lawn mower. Summary of the invention

[0004] The present invention aims to solve the problems in the prior art that the blade drive device of a lawn mower is large in size and has poor heat dissipation effect, and designs a drive device for the lawn mower.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a transmission device for a lawn mower, comprising an outer shell, a connecting shaft, a connecting sleeve and a connecting short column, the top of the outer shell is provided with a connecting end plate for fixing the outer shell to a fixed frame part of the lawn mower, an annular cavity is provided in the top of the outer shell, the inner end of the annular cavity is communicated with the central cavity of the outer shell, an outer ring cavity and a spiral cavity are provided inside the outer shell below the annular cavity, the outer ring cavity is located at the periphery of the spiral cavity, and the outer end of the inner cavity of the spiral cavity is communicated with the inner cavity of the outer ring cavity, the inner end of the inner cavity of the spiral cavity is communicated with the central cavity of the outer shell, a plurality of through holes are provided between the top surface of the outer ring cavity and the bottom surface of the annular cavity, and the outer wall of the outer shell is wavy;

[0006] The connecting shaft is rotatably sleeved in the central cavity of the outer shell, the connecting shaft is fixedly connected with a plurality of slats along the axial direction corresponding to the outer wall of the spiral cavity, a connecting slot matching with the output shaft sleeve of the lawn mower engine is provided at the center of the top surface of the connecting shaft, and a ball is fixedly connected to the end of the connecting shaft that passes through the bottom surface of the outer shell;

[0007] The bottom end of the connecting short column is provided with a mechanism for fixing the connecting short column to the rotary shaft of the lawn mower blade, and the top end of the connecting short column is vertically fixedly connected to the center position of the bottom surface of the connecting sleeve;

[0008] The sphere is rotatably sleeved in a spherical groove arranged inside the connecting sleeve, and the radius of the spherical groove is equal to the radius of the sphere.

[0009] Preferably, the connecting sleeve comprises an upper sleeve, a lower sleeve and a connecting bolt, the lower surface of the upper sleeve and the upper surface of the lower sleeve are respectively provided with a hemispherical groove, the upper surface of the upper sleeve is provided with an arc opening groove, the arc opening groove is tangent to the connection between the inner wall of the hemispherical groove, and the radius of the hemispherical groove is equal to the radius of the sphere;

[0010] Through holes are vertically arranged between the upper and lower surfaces at the edges of the upper and lower casings, and the connecting bolts are sleeved in the through holes.

[0011] Preferably, the inner wall of the connecting slot is axially provided with a strip groove which is slidably engaged with the power output shaft of the lawn mower motor.

[0012] Preferably, the cross section of the slat is arc-shaped, and the arc-shaped opening is opposite to the opening at the inner end of the spiral cavity.

[0013] Preferably, the radius of the outer edge of the slat is equal to the vertical distance between the central axis of the outer shell and the inner end of the spiral cavity corresponding to the inner wall of the outer shell.

[0014] Preferably, it also includes bearings, which are respectively mounted on the top and bottom ends of the central cavity of the outer shell, the inner cavity of the bearing is sleeved with the connecting shaft, and the bearing is a single-row tapered roller bearing.

[0015] Preferably, the cone angle of the tapered roller of the bearing is 25-28°.

[0016] Preferably, it further comprises an upper blocking plate and a lower blocking plate, wherein the upper blocking plate is fixedly sleeved at a central position on the top end of the outer shell, and the upper blocking plate is used to position and fix the bearing on the top end of the outer shell;

[0017] Wherein, the lower blocking plate is fixedly sleeved on the center position of the bottom end of the outer shell, and the lower blocking plate is used to position and fix the bearing at the bottom of the outer shell.

[0018] Preferably, it also includes a baffle, which is rotatably sleeved on the outer periphery of the connecting shaft body near the bearing position, and the baffle is used to position and fix the bearing, and a water sealing structure is formed between the inner wall of the baffle and the outer wall of the connecting shaft body.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The transmission device of the present invention has a simple structure, a small size, is easy to use, and reduces the workload of equipment maintenance.

[0021] 2. The transmission device involved in the present invention can form a channel for grease circulation inside the outer shell, and the grease can obtain sufficient heat diffusion in the outer ring cavity, which greatly improves the heat dissipation effect of the grease and increases the service life of the device.

[0022] 3. The transmission device of the present invention can realize a small amount of vertical rotation of the lawn mower blade relative to the power mechanism through the connecting sleeve, so that the lawn mower can drive the blade to work normally on the low and uneven lawn ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the main structure of the present invention as a whole;

[0024] Figure 2 For the present invention Figure 1 AA cross-sectional structure diagram;

[0025] Figure 3 It is a schematic diagram of the three-dimensional structure of the connecting shaft body of the present invention;

[0026] Figure 4 It is a schematic diagram of the three-dimensional structure of the upper half of the casing of the present invention;

[0027] Figure 5 It is a schematic diagram of the three-dimensional structure of the lower half of the casing of the present invention;

[0028] Figure 6 It is a schematic diagram of the three-dimensional structure of the connecting short columns of the present invention.

[0029] In the figure: 100-outer shell; 101-outer ring cavity; 102-annular cavity; 103-spiral cavity; 104-through hole; 105-connecting end plate; 200-connecting shaft; 201-connecting slot; 202-slat; 203-sphere; 204-strip groove; 300-bearing; 400-upper plugging plate; 500-baffle; 600-lower plugging plate; 700-connecting sleeve; 701-upper half sleeve; 7011-arc opening groove; 7012-hemispherical groove; 702-lower half sleeve; 703-connecting bolt; 800-connecting short column. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] See also Figure 1-6 The present invention provides a technical solution, a transmission device for a lawn mower, comprising an outer shell 100, a connecting shaft 200, a connecting sleeve 700 and a connecting short column 800, a connecting end plate 105 for fixing the outer shell 100 to a fixed frame of the lawn mower is arranged at the top of the outer shell 100, an annular cavity 102 is arranged inside the top of the outer shell 100, the inner end of the annular cavity 102 is communicated with the central cavity of the outer shell 100, an outer ring cavity 101 and a spiral cavity 103 are arranged below the annular cavity 102 inside the outer shell 100, the outer ring cavity 101 is located at the periphery of the spiral cavity 103, and the outer end of the inner cavity of the spiral cavity 103 is communicated with the inner cavity of the outer ring cavity 101, and the inner end of the inner cavity of the spiral cavity 103 is communicated with the central cavity of the outer shell 100, a plurality of through holes 104 are opened between the top surface of the outer ring cavity 101 and the bottom surface of the annular cavity 102, and the outer wall of the outer shell 100 is wavy;

[0032] The connecting shaft 200 is rotatably sleeved in the central cavity of the outer shell 100, and the connecting shaft 200 is fixedly connected with a plurality of slats 202 along the axial direction corresponding to the outer wall of the spiral cavity 103, and a connecting slot 201 matching with the output shaft sleeve of the lawn mower engine is provided in the center of the top surface of the connecting shaft 200, and a ball 203 is fixedly connected to the end of the connecting shaft 200 that passes through the bottom surface of the outer shell 100;

[0033] The bottom end of the connecting short column 800 is provided with a mechanism for fixing the connecting short column 800 to the rotary shaft of the lawn mower blade, and the top end of the connecting short column 800 is vertically fixedly connected to the center position of the bottom surface of the connecting sleeve 700;

[0034] The sphere 203 is rotatably sleeved in a spherical groove provided inside the connecting sleeve 700 , and the radius of the spherical groove is equal to the radius of the sphere 203 .

[0035] Among them, there is a large friction force between the ball 203 and the inner wall of the spherical groove inside the connecting sleeve 700, so that the connecting shaft 200 can drive the cutter disc to rotate through the connecting sleeve 700 and the connecting short column 800; when the lawn surface is uneven, the parallel rotation of the cutter disc encounters a large resistance and it is difficult to rotate, and the ball 203 and the connecting sleeve 700 rotate relative to each other in the vertical direction to avoid the problem of engine overload and damage, so that the lawn mower can flexibly adapt to the uneven lawn surface.

[0036] In this embodiment, the connecting sleeve 700 includes an upper sleeve 701, a lower sleeve 702 and a connecting bolt 703. The lower surface of the upper sleeve 701 and the upper surface of the lower sleeve 702 are respectively provided with a hemispherical groove 7012. The upper surface of the upper sleeve 701 is provided with an arc opening groove 7011. The arc opening groove 7011 is tangent to the inner wall of the hemispherical groove 7012 at the connection point. The radius of the hemispherical groove 7012 is equal to the radius of the sphere 203.

[0037] Through holes are vertically provided between the upper and lower surfaces of the edges of the upper half casing 701 and the lower half casing 702, and the connecting bolts 703 are sleeved in the through holes.

[0038] In this embodiment, a strip groove 204 is axially provided on the inner wall of the connecting slot 201 for slidingly engaging with the power output shaft of the lawn mower motor.

[0039] In this embodiment, the cross section of the strip 202 is arc-shaped, and the opening of the arc is opposite to the opening at the inner end of the spiral cavity 103 .

[0040] In this embodiment, the radius of the outer edge of the slat 202 is equal to the vertical distance between the central axis of the outer shell 100 and the inner wall of the outer shell 100 corresponding to the inner end of the spiral cavity 103 .

[0041] In this embodiment, a bearing 300 is also included. The bearing 300 is respectively mounted on the top and bottom ends of the central cavity of the outer shell 100. The inner cavity of the bearing 300 is sleeved with the connecting shaft 200. The bearing 300 is a single-row tapered roller bearing.

[0042] In this embodiment, the cone angle of the tapered roller of the bearing 300 is 25-28°.

[0043] In this embodiment, an upper blocking plate 400 and a lower blocking plate 600 are also included. The upper blocking plate 400 is fixedly sleeved at the center of the top of the outer shell 100. The upper blocking plate 400 is used to position and fix the bearing 300 at the top of the outer shell 100.

[0044] The lower plugging plate 600 is fixedly sleeved at the center of the bottom end of the outer shell 100 , and the lower plugging plate 600 is used to position and fix the bearing 300 at the bottom of the outer shell 100 .

[0045] In this embodiment, a baffle 500 is also included. The baffle 500 is rotatably sleeved on the outer periphery of the connecting shaft 200 near the bearing 300. The baffle 500 is used to position and fix the bearing 300. A water-tight structure is formed between the inner wall of the baffle 500 and the outer wall of the connecting shaft 200.

[0046] Working principle: When in use, the power output shaft of the lawn mower engine is connected through the connecting slot 201 and the strip groove 204 on its inner wall; the transmission device as a whole is fixedly connected to the fixed frame part of the lawn mower through the connecting end plate 105; the bottom end of the connecting short column 800 is connected to the rotating shaft of the cutter disc; the engine drives the connecting sleeve 700 to rotate through the friction between the ball 203 at the bottom of the connecting shaft 200 and the inner wall of the hemispherical groove 7012, and the connecting sleeve 700 drives the cutter disc to rotate through the connecting short column 800 to perform the mowing operation; when the lawn surface is uneven, the cutter disc encounters a large resistance when rotating horizontally, and the resistance is greater than the friction between the ball 203 and the inner wall of the hemispherical groove 7012, the ball 203 will rotate with the hemispherical groove 7012 undergoes relative rotation in the vertical direction, so that the blade disc can smoothly perform the mowing operation; the internal cavity of the outer shell 100 is filled with grease, and when the connecting shaft 200 drives the slats 202 to rotate, the grease in the central cavity is discharged from the inner end opening of the spiral cavity 103 to the spiral cavity 103, and the grease enters the outer ring cavity 101 from the opening at the outer end of the spiral cavity 103, and then enters the annular cavity 102 through the through hole 104, so that the grease in the annular cavity 102 flows back into the central cavity to realize the circulation of the grease, and the grease in the outer ring cavity 101 can fully contact the inner wall of the outer wall of the outer shell 100, so that the heat in the grease can be continuously diffused to the outside, which greatly improves the heat dissipation efficiency of the grease.

[0047] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A transmission device for a lawn mower, characterized in that: include: An outer shell (100); Connecting shaft (200); A connecting sleeve (700) and a connecting short column (800), the top of the outer shell (100) is provided with a connecting end plate (105) for fixing the outer shell (100) to a fixed frame of the lawn mower, the top of the outer shell (100) is provided with an annular cavity (102), the inner end of the annular cavity (102) is communicated with the central cavity of the outer shell (100), the outer shell (100) is provided with an outer ring cavity (101) and a spiral cavity (103) located below the annular cavity (102), the outer ring cavity (101) is located on the periphery of the spiral cavity (103), and the outer end of the inner cavity of the spiral cavity (103) is communicated with the inner cavity of the outer ring cavity (101), and the spiral cavity (103) is provided inside the outer shell (100). 3) The inner end of the inner cavity is connected to the central cavity of the outer shell (100), a plurality of through holes (104) are provided between the top surface of the outer ring cavity (101) and the bottom surface of the annular cavity (102), and the outer wall of the outer shell (100) is in a wave shape; wherein the connecting shaft (200) is rotatably sleeved in the central cavity of the outer shell (100), and the connecting shaft (200) is axially fixedly connected with a plurality of slats (202) corresponding to the outer wall of the spiral cavity (103), a connecting slot (201) matching with the output shaft sleeve of the lawn mower engine is provided at the center of the top surface of the connecting shaft (200), and a ball (203) is fixedly connected to the end of the connecting shaft (200) that passes through the bottom surface of the outer shell (100); The bottom end of the connecting short column (800) is provided with a mechanism for fixedly connecting the connecting short column (800) to the rotary shaft of the lawn mower blade, and the top end of the connecting short column (800) is fixedly connected to the center position of the lower surface of the connecting sleeve (700); The spherical body (203) is rotatably sleeved in a spherical groove provided inside the connecting sleeve (700), and the radius of the spherical groove is equal to the radius of the spherical body (203); The bearing (300) is also included. The bearing (300) is respectively mounted on the top and bottom ends of the central cavity of the outer shell (100). The inner cavity of the bearing (300) is sleeved with the connecting shaft (200). The bearing (300) is a single-row tapered roller bearing. The tapered angle of the tapered roller of the bearing (300) is 25 to 28°. It also includes: an upper blocking plate (400) and a lower blocking plate (600), wherein the upper blocking plate (400) is fixedly sleeved at a central position at the top of the outer shell (100), and the upper blocking plate (400) is used to position and fix the bearing (300) at the top of the outer shell (100); The lower blocking plate (600) is fixedly sleeved at a central position of the bottom end of the outer shell (100), and the lower blocking plate (600) is used to position and fix the bearing (300) at the bottom of the outer shell (100).

2. A transmission device for a lawn mower according to claim 1, characterized in that: The connecting sleeve (700) comprises: an upper sleeve (701); A lower half sleeve (702) and a connecting bolt (703), the lower surface of the upper half sleeve (701) and the upper surface of the lower half sleeve (702) are respectively provided with a hemispherical groove (7012), the upper surface of the upper half sleeve (701) is provided with an arc opening groove (7011), the arc opening groove (7011) is tangent to the connection between the inner wall of the hemispherical groove (7012), the radius of the hemispherical groove (7012) is equal to the radius of the sphere (203), and the center position of the bottom surface of the lower half sleeve (702) is fixedly connected to the top of the connecting short column (800); Through holes are vertically provided between the upper and lower surfaces at the edges of the upper half casing (701) and the lower half casing (702), and the connecting bolts (703) are sleeved in the through holes.

3. A transmission device for a lawn mower according to claim 2, characterized in that: The inner wall of the connecting slot (201) is provided with a strip groove (204) along the axial direction for slidingly engaging with the power output shaft of the lawn mower motor.

4. A transmission device for a lawn mower according to claim 3, characterized in that: The cross section of the strip (202) is arc-shaped, and the arc-shaped opening is opposite to the opening at the inner end of the spiral cavity (103).

5. A transmission device for a lawn mower according to claim 4, characterized in that: The radius of the outer edge of the slat (202) is equal to the vertical distance between the central axis of the outer shell (100) and the inner end of the spiral cavity (103) corresponding to the inner wall of the outer shell (100).

6. A transmission device for a lawn mower according to claim 5, characterized in that: Also includes: The baffles (500) are rotatably sleeved on the periphery of the connecting shaft (200) near the bearing (300), and the baffles (500) are used to position and fix the bearing (300). A water-tight structure is formed between the inner wall of the baffle (500) and the outer wall of the connecting shaft (200).

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